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SubjectRE: [PATCH v18 0/6] drm/i915/gvt: Dma-buf support for GVT-g
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> -----Original Message-----
> From: intel-gvt-dev [mailto:intel-gvt-dev-bounces@lists.freedesktop.org] On
> Behalf Of Zhenyu Wang
> Sent: Thursday, November 23, 2017 2:13 PM
> To: Gerd Hoffmann <kraxel@redhat.com>
> Cc: Tian, Kevin <kevin.tian@intel.com>; alex.williamson@redhat.com; intel-
> gfx@lists.freedesktop.org; joonas.lahtinen@linux.intel.com; Wang, Zhi A
> <zhi.a.wang@intel.com>; linux-kernel@vger.kernel.org;
> zhenyuw@linux.intel.com; Zhang, Tina <tina.zhang@intel.com>;
> kwankhede@nvidia.com; Lv, Zhiyuan <zhiyuan.lv@intel.com>; daniel@ffwll.ch;
> chris@chris-wilson.co.uk; intel-gvt-dev@lists.freedesktop.org; Yuan, Hang
> <hang.yuan@intel.com>
> Subject: Re: [PATCH v18 0/6] drm/i915/gvt: Dma-buf support for GVT-g
>
> On 2017.11.15 11:49:00 +0100, Gerd Hoffmann wrote:
> > On Wed, Nov 15, 2017 at 05:11:49PM +0800, Tina Zhang wrote:
> > > v17->v18:
> > > 1) unmap vgpu's opregion when destroying vgpu.
> > > 2) update comments for VFIO_DEVICE_GET_GFX_DMABUF. (Alex)
> >
> > > This patch set adds the dma-buf support for intel GVT-g.
> > >
> > > dma-buf is an uniform mechanism to share DMA buffers across
> > > different devices and subsystems. dma-buf for intel GVT-g is mainly
> > > used to share the vgpu's framebuffer to userspace to leverage
> > > userspace graphics stacks to render the framebuffer to the display monitor.
> > >
> > > The main idea is that we create a gem object and set vgpu's
> > > framebuffer as its backing storage. Then, export a dma-buf associated with
> this gem object.
> > > With the fd of this dma-buf, userspace can directly handle this buffer.
> > >
> > > This patch set can be tried with the following example:
> > > git://git.kraxel.org/qemu branch: work/intel-vgpu
> > >
> > > A topic branch with the latest patch set is:
> > > https://github.com/intel/gvt-linux.git branch: topic/dmabuf
> >
> > Tested-by: Gerd Hoffmann <kraxel@redhat.com>
> >
>
> After debugging with Tina on one left race that fixed by
> https://lists.freedesktop.org/archives/intel-gvt-dev/2017-
> November/002505.html
The next version of this patch set will include this patch.
Thanks.

BR,
Tina
>
> I still need below qemu fix for proper cursor handling, otherwise qemu just
> crashed when I click in my terminal program which hides cursor then.
>
> diff --git a/hw/vfio/display.c b/hw/vfio/display.c index
> e500ec2cb1..d9a044b080 100644
> --- a/hw/vfio/display.c
> +++ b/hw/vfio/display.c
> @@ -169,8 +169,9 @@ static void vfio_display_dmabuf_update(void *opaque)
> cursor = vfio_display_get_dmabuf(vdev, DRM_PLANE_TYPE_CURSOR);
> if (vdev->cursor != cursor) {
> vdev->cursor = cursor;
> - dpy_gl_cursor_dmabuf(vdev->display_con,
> - &cursor->buf);
> + if (cursor)
> + dpy_gl_cursor_dmabuf(vdev->display_con,
> + &cursor->buf);
> free_bufs = true;
> }
> if (cursor != NULL) {
>
> And with these it seems pretty fine now that I'll queue them up for -next pull.
>
> thanks
>
> --
> Open Source Technology Center, Intel ltd.
>
> $gpg --keyserver wwwkeys.pgp.net --recv-keys 4D781827

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